version: 0.4.4
# virt-clone -o vm_debian1 -n vm_debian2 -f /media/disk/vm02.img
ERROR: Disk size must be an int or a float.
^^^^^^^^^^^
|_ the message is not related to the real error.
Once I deleted the file /media/disk/vm02.img, the cloning operation succeeded (btw it could be fine to allow to overwrite the target image)

This is actually an issue in the python-virtinst package.
I've fixed this upstream: now if you try -f 'some-existing-file', virt-clone will prompt the user saying something like "This will overwrite 'file', are you sure you want to use this path?" Which seems a sufficient solution to me.
http://hg.et.redhat.com/virt/applications/virtinst--devel?cs=dade986aa3bd
Closing as UPSTREAM.

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